Node III - HTTP

Node III - HTTP

Node HTTP Module

Using the module: var http = require('http');
Creating a server: var server = http.createServer(function(req, res){ . . . });
Starting the server: server.listen(port, . . . );

Request

Incoming request message information available through the first parameter “req”

req.headers, req.body, . . .

Response

Response message is constructed on the second parameter “res”

res.setHeader("Content-Type", "text/html");
res.statusCode = 200;
res.writeHead(200, { 'Content-Type': 'text/html' });
res.write(’Hello World!');
res.end(' <html><body><h1>Hello World</h1></body></html> ');

Example

var http = require('http');

var hostname = 'localhost';

var port = 3000;

var server = http.createServer(function(req, res){
console.log(req.headers);

res.writeHead(200, {'Content-Type': 'text/html'});
res.end('<html><body><h1>Hello World</h1></body></html>');

})

server.listen(port, hostname, function(){
console.log(`Listening ${hostname} : ${port}/`);
console.log(`Server running at http://${hostname}:${port}/`);
});

Executing

Mac: in the console type:
curl http://localhost:3000
Postman: plugin for chrome

Node path Module

Using path Module: var path = require('path');
Some example path methods:

path.resolve('./public'+fileUrl);
path.extname(filePath);

Node fs Module

Use fs module in your application var fs = require(‘fs’);
Some example fs methods:

fs.exists(filePath, function(exists) { . . . } );
fs.createReadStream(filePath).pipe(res);

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